CN110261055B - Large-scale accurate impact test system - Google Patents
Large-scale accurate impact test system Download PDFInfo
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- CN110261055B CN110261055B CN201910665427.6A CN201910665427A CN110261055B CN 110261055 B CN110261055 B CN 110261055B CN 201910665427 A CN201910665427 A CN 201910665427A CN 110261055 B CN110261055 B CN 110261055B
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- 238000009863 impact test Methods 0.000 title claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 48
- 238000013016 damping Methods 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 230000001133 acceleration Effects 0.000 claims abstract description 14
- 230000001360 synchronised effect Effects 0.000 claims description 33
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 230000007704 transition Effects 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 15
- 239000002689 soil Substances 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 239000011150 reinforced concrete Substances 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 238000004880 explosion Methods 0.000 abstract description 26
- 238000002474 experimental method Methods 0.000 abstract description 4
- 230000006378 damage Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 9
- 238000011160 research Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000004088 simulation Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002360 explosive Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 235000017899 Spathodea campanulata Nutrition 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/19—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein with a single cylinder and of single-tube type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3235—Constructional features of cylinders
- F16F9/3242—Constructional features of cylinders of cylinder ends, e.g. caps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/366—Special sealings, including sealings or guides for piston-rods functioning as guide only, e.g. bushings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a large-scale precise impact test system, which comprises: the device comprises a gas-liquid acceleration hydraulic cylinder, an impact plate, a supporting truss, a movable lifting platform, damping buffer devices, boundary constraint devices and a foundation base, wherein the gas-liquid acceleration hydraulic cylinder is arranged on the supporting truss, the high-speed rod end of the gas-liquid acceleration hydraulic cylinder is provided with the impact plate for impact test, the supporting truss is arranged on the foundation base and forms a closed frame structure with the foundation base, the movable lifting platform is arranged on the foundation base and located below the supporting truss, the damping buffer devices are arranged in the middle of the movable lifting platform, the boundary constraint devices are symmetrically arranged on two sides of the upper end face of the movable lifting platform, and an impacted test piece is arranged on the damping buffer devices and clamped and positioned through the boundary constraint devices. The invention has stable structure, can be used as a benchmark calibration experiment platform for researching explosion impact, and has the advantages of good repeatability, high precision, economy, high efficiency and the like.
Description
Technical Field
The invention relates to an impact test technology, in particular to a large-scale precise impact test system.
Background
The traditional explosion effect research means mainly depend on an on-site charge explosion test, but because a high Wen Bao bombing product is mixed with surrounding air to generate combustion to form a fireball zone during near-zone explosion, the measuring environment is very complicated and severe due to strong electromagnetic radiation, a large amount of charged particles, solid particles, fire lights and high temperature generated by explosive detonation, so that a sensor is extremely fragile, a measuring signal is severely disturbed, even a mechanical parameter signal is completely annihilated, and the repeatability of dynamic response mechanical parameter measurement of a structural member is reduced to an unacceptable degree. Especially, the high-speed camera cannot shoot the video signal of deformation and damage of the test piece in the area under the influence of the shielding of the fireball, and the deformation-damage occurrence and development change process of the test piece is the most important information data for analyzing the damage mode and mechanism of the test piece, so that new reinforcement technology (new materials, new components and reinforcement detail structures) and an antiknock design method are researched.
The near-zone explosion load is characterized by high overpressure peak value and short acting time, and has been proved by foreign experience that a large-scale precise impact experiment system can generate the load waveform. The damage effect research is carried out only by means of explosive explosion, which is not carried out in any country in time and expense consumption, but the large-scale precise impact adopting the non-explosion method can carry out explosion simulation test, so that a vivid explosion-like pressure/impulse waveform is generated, the repeatability is good, the effective data necessary for protection design and damage evaluation such as pressure, strain, displacement, acceleration and the like can be obtained in each test, the test period can be greatly shortened, a large amount of test research expenses can be saved, and particularly, the deformation of a test piece to the damage process can be observed from different angles by using a high-speed camera, so that the image data of the whole process is obtained, and the method is very important basic data for analysis of engineering structure deformation and damage mechanism and reinforcement and damage evaluation research.
At present, domestic explosive explosion tests are limited by conditions such as expenses, sites and the like, and only reduced-scale model tests can be carried out. For example, the prototype explosion test of reinforced concrete members generally requires several tens to hundreds of kg, even more than 1t, while the actual energy applied to the test piece is only a small part of explosion equivalent, and most of the energy is transmitted to the surrounding environment in the form of explosion waves, so that only a reduced scale model test can be performed in view of safety and cost; in general, the mean value dispersion of the near zone explosion test data is more than +/-20%, and even +/-50% dispersion and errors are not uncommon; therefore, it is not suitable to use the near-field explosion test data to calibrate and verify the numerical simulation method, but only a inequality in the absence of reliable accurate data.
Currently, there are two main large-scale indoor precision experiment systems for applying a normal ammunition blast load to a test piece by adopting a non-explosion method in a laboratory, and one of the large-scale indoor precision experiment systems utilizes gravitational potential energy to realize low-speed impact, namely a drop hammer type impact tester; the other is a hydraulic servo drive explosion simulator. At present, the built near-field explosion simulation test equipment in China belongs to drop hammer type test equipment, most of drop hammer mass is smaller (< 200 kg), effective drop height is lower (< 3 m), impact energy is lower (hundreds to thousands of kJ), and the near-field explosion simulation test equipment is mainly used for dynamic mechanical property tests of small test pieces such as metal, plastic and composite materials; and because of adopting the free falling body mode, the impact rate is generally low, and the explosion load waveform can not be effectively simulated, so that the domestic falling weight impact testing machine can not carry out the precise impact test. The main defects are as follows: the device has no mechanism for preventing the falling hammer from rebounding after impacting the component, the falling hammer and the component have obvious rebounding in the test, the secondary impact problem is quite serious, the measuring system is behind, the equipment controllability is poor, the main component precision is lower, the area of the hammer head is smaller, and the partial loading can only be carried out. Therefore, the test error is quite large, the repeatability is poor, the requirements of the precise impact test are not met, and the application range is greatly limited.
The high-speed hydraulic precision impact equipment capable of simulating near-zone explosion in China is basically blank, so that basic data of damage mechanism research is deficient, no base number is caused on damage effect, and the requirements of weapon damage effect and damage evaluation research under informatization conditions cannot be met.
Disclosure of Invention
Aiming at the defects in the background technology, the invention aims to provide a large-scale precise impact test system which is used for simulating single-point or multi-point explosion impact tests under different explosion parameters.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a large precision impact test system comprising: the whole test system is used for performing impact load test by taking at least one set of gas-liquid acceleration hydraulic cylinder as a power source, the gas-liquid acceleration hydraulic cylinder is arranged on the support truss, the high-speed rod end of the gas-liquid acceleration hydraulic cylinder is provided with an impact plate for impact test, the support truss is arranged on the foundation and forms a closed frame structure with the foundation, the movable lifting platform is arranged on the foundation and positioned below the support truss, the damping buffer device is arranged in the middle of the movable lifting platform, the boundary constraint devices are symmetrically arranged on two sides of the upper end face of the movable lifting platform, and an impacted test piece is arranged on the damping buffer device and clamped and positioned through the boundary constraint devices;
The foundation comprises a foundation body made of reinforced concrete, wherein the foundation body is arranged in a foundation pit, two sides of the foundation pit are fixedly connected with supporting earthwork, an artificial foundation is arranged at the bottom of the foundation pit, the artificial foundation comprises a three-layer soil layer arranged on a soil layer, a sand shockproof layer arranged on the three-layer soil layer and a waterproof layer arranged on the sand shockproof layer, the foundation body is composed of a cuboid A and a cuboid B which are fixedly integrated, the length and the width of the cuboid A are smaller than those of the cuboid B, the cuboid A is positioned in the middle of the bottom surface of the cuboid B, and one end face of the cuboid A in the long axis direction is flush with one end face of the cuboid B in the long axis direction; the middle part of the upper end surface of the cuboid B is provided with an axial through groove, the middle part of the bottom wall of the through groove is provided with bearing terraces parallel to the long axis of the through groove at intervals, and two ends of each bearing terrace are respectively level with two ends of the cuboid A in the long axis direction; the two sides of the bottom wall of the through groove are respectively provided with a damping groove parallel to the long axis of the through groove, the two ends of each damping groove are respectively parallel and level with the two ends of the long axis direction of the cuboid A, the outer side wall of each damping groove is respectively coplanar with the side wall of the through groove on the same side, a track terrace is further arranged between each damping groove and the adjacent bearing terrace, and the height of the upper end face of the track terrace is smaller than that of the bearing terrace; rectangular grooves are further formed in the middle of the end faces of the cuboid B, which are located on two sides of the through groove, and embedded connecting steel plates used for connecting the upper supporting trusses are arranged in the grooves;
The support truss comprises unit upright posts, system upright posts and system cross beams, wherein the whole unit upright posts are of a box-shaped columnar structure and are symmetrically arranged on two sides of the upper end face of a foundation, the upper end faces of the two unit upright posts are respectively and fixedly connected with two ends of the bottom face of the system cross beam, the lower ends of the two unit upright posts are respectively and fixedly connected with embedded connecting steel plates arranged on two sides of the upper end face of the foundation, the system upright posts are equally high with the unit upright posts, the system upright posts are also symmetrically arranged on two sides of the upper end face of the foundation and are respectively and fixedly connected with the unit upright posts on the same side, the upper end faces of the two system upright posts are parallel provided with system cross beams with zero space, the lower ends of the two system upright posts are respectively and fixedly connected with the embedded connecting steel plates arranged on two sides of the upper end face of the foundation, the whole system cross beam is of a box-shaped beam structure, the width of the system cross beam is equal to that of the unit upright posts, and the middle part of the system cross beam is perpendicular to a horizontal plane and is provided with uniformly distributed mounting holes for mounting gas-liquid accelerating hydraulic cylinders;
the movable lifting platform comprises a platform, bearing vehicles, synchronous lifting devices and parallel tracks, wherein the parallel tracks are fixedly connected with a track terrace of a foundation, the whole platform is of a steel rectangular plate-shaped structure, connecting plates with parallel intervals are symmetrically arranged on two sides of the platform, guide holes are formed in each connecting plate, the bearing vehicles are symmetrically arranged below the connecting plates on two sides of the platform and run on the tracks, two ends of each bearing vehicle are respectively connected with two connecting plates on the same side of the platform through guide posts, and the two ends of each bearing vehicle are respectively provided with the synchronous lifting devices and control lifting of the platform through the synchronous lifting devices; the bearing vehicle is formed by combining two vehicle bodies through connecting rods A, the two vehicle bodies are respectively arranged below two connecting plates on the same side of the platform, the whole vehicle body is of a cuboid structure, rail wheels are arranged at two ends of the lower part of the vehicle body, through grooves perpendicular to the length direction of the vehicle body are formed in the middle of the upper end face of the vehicle body, synchronous lifting devices are arranged in the middle of the walls of the through grooves, guide posts are symmetrically arranged on the bottom walls of the through grooves on two sides of the synchronous lifting devices, the guide posts are matched with guide holes on the corresponding connecting plates of the platform, the front end of the connecting rod A is fixedly connected with the rear end of one vehicle body, and the rear end of the connecting rod A is fixedly connected with the front end of the other vehicle body; the synchronous lifting device is a synchronous oil cylinder, the synchronous oil cylinder is fixedly connected with the bottom wall of the through groove of the vehicle body through an oil cylinder seat, and the initial zero position of the synchronous oil cylinder is lower than the upper end surface of the vehicle body; the bearing vehicle is also provided with a synchronous motor which is arranged on the side surface of one vehicle body of the bearing vehicle and drives the wheel shaft of one rail wheel on the vehicle body through a speed reducing mechanism.
The damping buffer device consists of a cylinder body, a cylinder seat, a cylinder cover, a piston, a connecting rod B, a bearing plate, buffer blocks and guide rods, wherein the cylinder seat is fixedly connected with the platform through bolts, the lower end of the cylinder body is fixedly arranged on the cylinder seat and is in sealing connection with the cylinder seat, the cylinder cover is fixedly arranged at the upper end of the cylinder body and is in sealing connection with the cylinder body, the piston is arranged in the cylinder body and is in sliding sealing fit with the cylinder body, the cylinder seat is respectively provided with an air inlet hole and an air outlet hole which are communicated with the interior of the cylinder body, the middle part of the piston is provided with coaxial axial through holes A, the axial through holes C which are uniformly distributed are arranged with the through holes A as the center, each axial through hole C is internally provided with the guide rods, the lower ends of the guide rods are arranged on the cylinder seat, the upper ends of the guide rods are arranged on the cylinder cover and are fixed through the cylinder cover in a compressing mode, springs are sleeved between the lower ends of the guide rods and the piston, the connecting rod B is arranged in a penetrating way at the middle of the cylinder cover and is in sliding sealing fit with the cylinder cover, the lower ends of the connecting rod B are fixedly integrated with the piston, the upper ends of the connecting rod B are fixedly connected with the bearing plate, and the bearing plate is provided with the buffer blocks; the guide rod is integrally of a step shaft structure made of high-strength alloy steel and comprises a first step shaft, a second step shaft, a transition part and a positioning shaft, wherein the first step shaft is arranged in an axial through hole C of a piston in a penetrating mode and is in sliding sealing fit with the axial through hole C, the diameter of the first step shaft is larger than that of the second step shaft, the upper end of the first step shaft is provided with a coaxial positioning shaft, the lower portion of the first step shaft is provided with a coaxial second step shaft, the transition part is arranged between the first step shaft and the second step shaft and is integrally fixed through the transition part, the transition part is of a cone frustum structure, the diameter of the upper end face of the transition part is equal to that of the first step shaft, and the diameter of the lower end face of the transition part is equal to that of the second step shaft; the upper end surface of the cylinder seat is provided with uniformly distributed mounting holes corresponding to the axial through holes C of the piston one by one, and the inner diameter of each mounting hole is in clearance fit with the outer diameter of the second step shaft of the guide rod; the lower end surface of the cylinder cover is provided with uniformly distributed positioning holes corresponding to the axial through holes C of the piston one by one, and the inner diameter of each positioning hole is in clearance fit with the outer diameter of the positioning shaft of the guide rod; the connecting rod B is coaxially provided with an inner hole with an opening at one end, and the opening end of the inner hole is positioned at the lower end of the connecting rod B and communicated with the axial through hole A of the piston; the inlet end of the air inlet hole of the cylinder seat is communicated with an external air inlet pipeline through a check valve, and the outlet end of the air outlet hole of the cylinder seat is communicated with an external loop through a pressure reducing valve.
The boundary constraint device comprises a left movable jacking device and a right movable jacking device, the left movable jacking device is arranged on the left side of a long axis of the platform, the right movable jacking device is arranged on the right side of the long axis of the platform, the left movable jacking device and the right movable jacking device are symmetrical with respect to the long axis of the platform, the left movable jacking device comprises guide rail groups, a bottom plate, upright posts, a beam B, moving blocks, jacking blocks and fixing blocks, the number of the guide rail groups is two, each guide rail group consists of a pair of linear guide rails parallel to the short axis of the platform, the two guide rail groups are arranged on the left side of the length direction of the platform at intervals, fixing blocks are arranged on the platform between the two linear guide rails of each guide rail group, a bottom plate is arranged above each guide rail group, the bottom plate is detachably fixedly connected with the platform through the fixing blocks, two sides of the bottom plate bottom surface are respectively operated on the parallel linear guide rails through sliding blocks, one side of the upper end surface of the bottom plate, which is perpendicular to the upper end surface of the guide rail, the beam B is arranged above the two bottom plate and is respectively fixedly connected with the two upright posts on the two adjacent upright posts, and the two jacking blocks are respectively arranged on the middle part of the two upright posts in a clamping mode, and each upright post is fixedly connected with the movable cross rail B; the whole movable block is of a rectangular box-type structure with two open ends, the external dimensions of the two open ends of the movable block are matched with the external dimensions of the cross section of the cross beam B, and the two side walls of the movable block are symmetrically provided with assembly holes for installing the jacking block; the jacking block consists of a positioning sleeve, a backup nut and a fastening bolt, the whole positioning sleeve is of a cylindrical structure, a threaded through hole is formed in the positioning sleeve, the fastening bolt for jacking a test piece is arranged in the threaded through hole, and external threads are respectively arranged at two ends of the outer cylindrical surface of the positioning sleeve and are respectively arranged in assembly holes on two side walls of the moving block through the backup nut; the whole beam B is of a cuboid frame structure with upper and lower openings, through grooves are symmetrically formed in two sides of the length direction of the beam B, and the axial line of the through grooves in the length direction is equal to the center of the assembly hole of the movable block in height; the lower end face of the fixed block is fixedly connected with the platform, the upper end face of the fixed block is provided with uniformly distributed threaded holes according to a rectangular array, and the bottom plate is fixedly connected with the fixed block through bolts; the baffle plate is characterized in that a baffle plate used for bearing external driving is further arranged between the upright posts adjacent to the upper end face of the bottom plate, the lower end of the baffle plate is fixedly connected with the bottom plate, and the two ends of the baffle plate are fixedly connected with the upright posts respectively.
The track terrace is of an embedded steel solid beam structure, the cross section of the track terrace is I-shaped, the upper end face of each track terrace is parallel to the horizontal plane and is equal to the upper end face of the adjacent track terrace in height, and the track terrace is parallel to the long axis of the cuboid B and is equal to the cuboid B in length.
The bearing terrace is of a pre-buried steel solid beam structure, the section of the bearing terrace is I-shaped, and the upper end face of each bearing terrace is parallel to a horizontal plane and has the same height as the upper end face of the adjacent bearing terrace.
The depth of the damping groove is larger than the height of the cuboid B.
The basic principle of the invention is as follows: pushing the plurality of impact modules by the plurality of high-speed gas-liquid drivers; the front end of a piston rod of each set of high-speed gas-liquid driver is connected with an impact module, and when the impact modules accelerate to a certain speed (the speeds of the impact modules of each set can be the same or different), the impact modules impact the full-scale model of the structure/member at the same time; the structure and the mass of the impact module are adjusted, and the impact speed is controlled, so that the specific impulse acting on the full-scale component is the same as the specific impulse acting on the structural component by the actual conventional ammunition explosion, thereby achieving the purpose of realistically simulating the damage effect of the conventional ammunition explosion on the structure/component.
The beneficial effects of the invention are as follows: the invention adopts the newly developed gas-liquid accelerating hydraulic cylinder as a driving source, and the whole test system has a stable structure through the total structural design, can be used as a standard calibration test platform for researching explosion impact, has the advantages of good repeatability, high precision, economy, high efficiency and the like, can provide enough accurate test data, and provides verification and calibration for relevant research means (such as digital simulation) of explosion impact dynamics research.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is a front view of the present invention.
Fig. 4 is a side view of the present invention.
Fig. 5 is a schematic view of a foundation structure.
Fig. 6 is a perspective view of the base body.
Fig. 7 is a front view of the base body.
Fig. 8 is a schematic view of a mobile lift platform.
Fig. 9 is a front view of the mobile lift platform.
Fig. 10 is a schematic view of a damping cushion.
FIG. 11 is a schematic view of a piston in a damping cushion.
Fig. 12 is a schematic view of a boundary restraining device.
Fig. 13 is a schematic diagram of a moving block in the boundary constraint device.
Fig. 14 is a schematic view of a tightening block in the boundary restraining device.
In the figure: 1. track, 2, platform, 201, connecting plate, 202, guiding hole, 301, car body, 302, connecting rod a,303, synchronous motor, 304, track wheel, 305, speed reducing mechanism, 306, wheel axle, 4, synchronous cylinder, 401, cylinder seat, 5, damping buffer device, 501, cylinder body, 502, cylinder seat, 503, cylinder cover, 504, piston, 505, connecting rod B,506, bearing plate, 507, buffer block, 508, guiding rod, 509, air inlet hole, 510, air outlet hole, 541, axial through hole a,542, axial through hole C,581, first step shaft, 582, second step shaft, 583, transition part, 584, positioning shaft, 585, spring, 601, bottom plate, 602, stand column, 603, beam B,604, moving block, 605, tightening block, 606, fixed block, 608, linear guide, 609, baffle, 651, locating sleeve, 652, tightening nut, 653, fastening bolt, 7, foundation body, 701, cuboid a,702, cuboid B,703, through groove 3, 704, bearing terrace, 705, damping groove, 706, track terrace, 707, connecting steel plate, 708, pile foundation, 709, waterproof layer, 710, sand shockproof layer, 711, three-in-one soil layer, 8, gas-liquid accelerating hydraulic cylinder, 901, unit stand column, 902, system stand column, 903, system beam. 10. Guide post, 11, impingement plate.
Detailed Description
The invention is described in further detail below with reference to the drawings.
As shown in fig. 1,2, 3, and 4, a large-scale precision impact test system includes: the whole test system takes at least one set of gas-liquid acceleration hydraulic cylinder 8 as a power source to carry out impact load test, the gas-liquid acceleration hydraulic cylinder 8 is arranged on a support truss 9, the high-speed rod end of the gas-liquid acceleration hydraulic cylinder 8 is provided with an impact plate 11 for impact test, the support truss 9 is arranged on the foundation and forms a closed frame structure with the foundation, the movable lifting platform is arranged on the foundation and below the support truss 9, the damping buffer device 5 is arranged in the middle of the movable lifting platform, the boundary constraint devices are symmetrically arranged on two sides of the upper end face of the movable lifting platform, and an impacted test piece is arranged on the damping buffer device 5 and clamped and positioned through the boundary constraint devices;
The foundation comprises a foundation body 7 made of reinforced concrete, wherein the foundation body 7 is arranged in a foundation pit, two sides of the foundation pit are fixedly connected with supporting earthwork, an artificial foundation is arranged at the bottom of the foundation pit, the artificial foundation comprises a three-layer soil layer 711 arranged on the soil layer, a sand shockproof layer 710 arranged on the three-layer soil layer 711 and a waterproof layer 709 arranged on the sand shockproof layer 710, the foundation body 7 is composed of a cuboid A701 and a cuboid B702 which are fixedly integrated, the length and the width of the cuboid A701 are smaller than those of the cuboid B702, the cuboid A701 is positioned in the middle of the bottom surface of the cuboid B702, and one end face of the cuboid A701 in the long axis direction is flush with one end face of the cuboid B702 in the long axis direction; an axial through groove 703 is formed in the middle of the upper end surface of the cuboid B702, bearing floors 704 parallel to the long axis of the through groove 703 are arranged in the middle of the bottom wall of the through groove 703 at intervals, and two ends of each bearing floor 704 are respectively level with two ends of the cuboid A701 in the long axis direction; damping grooves 705 parallel to the long axis of the through groove 703 are respectively arranged on two sides of the bottom wall of the through groove 703, two ends of each damping groove 705 are respectively parallel and level with two ends of the cuboid A701 in the long axis direction, the outer side wall of each damping groove 705 is coplanar with the side wall of the through groove 703 on the same side, a track terrace 706 is further arranged between each damping groove 705 and the adjacent bearing terrace 704, and the height of the upper end surface of each track terrace 706 is smaller than that of the corresponding bearing terrace 704; rectangular grooves are further formed in the middle of the end faces of the cuboid B702, which are located on two sides of the through groove 703, and embedded connecting steel plates 707 used for connecting the upper supporting trusses are arranged in the grooves;
The supporting truss comprises unit upright posts 901, system upright posts 902 and system cross beams 903, wherein the whole unit upright posts 901 are of a box-shaped columnar structure, the unit upright posts 901 are symmetrically arranged on two sides of the upper end face of a foundation 7, the upper end faces of the two unit upright posts 901 are respectively and fixedly connected with two ends of the bottom face of the system cross beams, the lower ends of the two unit upright posts 901 are respectively and fixedly connected with embedded connecting steel plates 707 arranged on two sides of the upper end face of the foundation 7, the system upright posts 902 are equally high with the unit upright posts 901, the system upright posts 902 are also symmetrically arranged on two sides of the upper end face of the foundation 7 and fixedly connected with the unit upright posts 901 on the same side, the upper end faces of the two system upright posts 902 are parallel provided with system cross beams 903 with zero space, the lower ends of the two system upright posts 902 are respectively and fixedly connected with the embedded connecting steel plates 707 arranged on two sides of the upper end face of the foundation 7, the whole system cross beams 903 are of a box-shaped beam structure, the width of the system cross beams is equal to the width of the unit upright posts 901, and the middle parts of the system cross beams 903 are perpendicular to a horizontal plane and are provided with mounting holes for mounting gas-liquid acceleration hydraulic cylinders 8;
The movable lifting platform comprises a platform 2, bearing vehicles, synchronous lifting devices and parallel tracks 1, wherein the parallel tracks 1 are fixedly connected with a track terrace 706 of a foundation, the platform 2 is of a steel rectangular plate-shaped structure, connecting plates 201 with parallel intervals are symmetrically arranged on two sides of the platform 2, guide holes 202 are formed in each connecting plate 201, the bearing vehicles are symmetrically arranged below the connecting plates 201 on two sides of the platform 2 and run on the tracks 1, two ends of each bearing vehicle are respectively connected with two connecting plates 201 on the same side of the platform 2 through guide posts 10, and the two ends of each bearing vehicle are respectively provided with the synchronous lifting devices and control lifting of the platform 2 through the synchronous lifting devices; the bearing vehicle is formed by combining two vehicle bodies 301 through connecting rods A302, the two vehicle bodies 301 are respectively arranged below two connecting plates 201 on the same side of a platform 2, the whole vehicle body 301 is of a cuboid structure, rail wheels 304 are arranged at two ends of the lower part of the vehicle body 301, through grooves perpendicular to the length direction of the vehicle body 301 are arranged in the middle of the upper end face of the vehicle body 301, synchronous lifting devices are arranged in the middle of the bottom wall of each through groove, guide posts 10 are symmetrically arranged on the bottom walls of the through grooves on two sides of each synchronous lifting device, the guide posts 10 are matched with guide holes 202 on the corresponding platform connecting plates 201, the front end of each connecting rod A302 is fixedly connected with the rear end of one vehicle body 301, and the rear end of each connecting rod A302 is fixedly connected with the front end of the other vehicle body 301; the carrier is also provided with a synchronous motor 303, and the synchronous motor 303 is arranged on the side surface of one vehicle body 301 of the carrier and drives an axle 306 of one rail wheel 304 on the vehicle body through a speed reducing mechanism 305; the synchronous lifting device 4 is a synchronous oil cylinder, the synchronous oil cylinder is fixedly connected with the bottom wall of the through groove of the vehicle body 301 through the oil cylinder seat 401, and the initial zero position of the synchronous oil cylinder 4 is lower than the upper end face of the vehicle body 301.
The damping buffer device consists of a cylinder body 501, a cylinder seat 502, a cylinder cover 503, a piston 504, a connecting rod B505, a bearing plate 506, buffer blocks 507 and guide rods 508, wherein the cylinder seat 502 is fixedly connected with a platform 2 through bolts, the lower end of the cylinder body 501 is fixedly arranged on the cylinder seat 502 and is in sealing connection with the cylinder seat 502, the cylinder cover 503 is fixedly arranged at the upper end of the cylinder body 501 and is in sealing connection with the cylinder body 501, the piston 504 is arranged in the cylinder body 501 and is in sliding sealing fit with the cylinder body 501, the middle part of the piston 504 is respectively provided with an air inlet 509 and an air outlet 510 which are communicated with the interior of the cylinder body 501, the middle part of the piston 504 is provided with coaxial axial through holes A541 and uniformly distributed axial through holes C542 taking the through holes A541 as the center, the lower end of the guide rods 508 are arranged on the cylinder seat, the upper ends of the guide rods 508 are arranged on the cylinder seat in a pressing and fixed through the cylinder cover 503, a spring 585 is sleeved between the lower end of the guide rods and the pistons, the connecting rod B505 is arranged in the middle part of the cylinder cover 503 in a sliding sealing fit with the cylinder cover 503, the connecting rod B505, the lower end of the connecting rod B505 is fixedly arranged with the connecting rod B506 and is fixedly connected with the bearing plate 506; the guide rod 508 is integrally formed by a step shaft structure made of high-strength alloy steel, and comprises a first step shaft 581, a second step shaft 582, a transition part 583 and a positioning shaft 584, wherein the first step shaft 581 is arranged in an axial through hole C542 of the piston 504 in a penetrating and sliding sealing fit with the axial through hole C542, the diameter of the first step shaft 581 is larger than that of the second step shaft 582, the upper end of the first step shaft 581 is provided with a coaxial positioning shaft 584, the lower part of the first step shaft 581 is provided with a coaxial second step shaft 582, a transition part 583 is arranged between the first step shaft 581 and the second step shaft 582 and is fixed into a whole through the transition part 583, the transition part 583 is in a cone-shaped structure, the diameter of the upper end surface of the first step shaft 581 is equal to that of the second step shaft 582, and the diameter of the lower end surface of the first step shaft 581 is equal to that of the second step shaft 582; the upper end surface of the cylinder base 502 is provided with uniformly distributed mounting holes corresponding to the axial through holes C542 of the piston 504 one by one, and the inner diameter of each mounting hole is in clearance fit with the outer diameter of the guide rod second step shaft 582; the lower end surface of the cylinder cover 503 is provided with uniformly distributed positioning holes corresponding to the axial through holes C542 of the piston 504 one by one, and the inner diameter of the positioning holes is in clearance fit with the outer diameter of the guide rod positioning shaft 584; the inside of the connecting rod B505 is coaxially provided with an inner hole 551 with an opening at one end, and the opening end of the inner hole 551 is positioned at the lower end of the connecting rod B505 and is communicated with an axial through hole A541 of the piston 504; the inlet end of the air inlet 509 of the cylinder base 502 is communicated with an external air inlet pipeline through a check valve, and the outlet end of the cylinder base air outlet 510 is communicated with an external circuit through a pressure reducing valve.
The boundary constraint device comprises a left movable jacking device and a right movable jacking device, the left movable jacking device is arranged on the left side of a long axis of the platform, the right movable jacking device is arranged on the right side of the long axis of the platform, the left movable jacking device and the right movable jacking device are symmetrical with respect to the long axis of the platform 2, the left movable jacking device comprises guide rail groups, a bottom plate 601, upright posts 602, a beam B603, a movable block 604, jacking blocks 605 and fixed blocks 606, the number of the guide rail groups is two, each guide rail group consists of a pair of linear guide rails 608 parallel to the short axis of the platform, the two guide rail groups are arranged on the left side of the long axis of the platform 2 at intervals, a fixed block 606 is arranged on the platform 2 between the two linear guide rails 608 of each guide rail group, a bottom plate 601 is arranged above each guide rail group and detachably fixedly connected with the platform 2 through the fixed block 606, two sides of the bottom plate 601 respectively run on the parallel linear guide rails 608 through the sliding blocks 609, the upper end faces of the bottom plate 601 are arranged on one side of the guide rails 608 at intervals and are perpendicular to the upright posts 602 of the bottom plate 601, the two adjacent jacking blocks 602 are respectively arranged on the two upright posts 602 and the middle part of the two upright posts 602 are respectively fixedly connected with the two upright posts 602 in the direction of the middle part 602; the whole movable block 604 is of a rectangular box-type structure with two open ends, the external dimensions of the two open ends are matched with the external dimensions of the cross section of the cross beam B603, and the two side walls of the movable block 604 are symmetrically provided with assembly holes for installing the jacking block 605; the jacking block 605 is composed of a positioning sleeve 651, a backup nut 652 and a fastening bolt 653, the positioning sleeve 651 is of a cylindrical structure, a threaded through hole is formed in the positioning sleeve, the fastening bolt 653 for jacking a test piece is arranged in the threaded through hole, external threads are respectively arranged at two ends of the outer cylindrical surface of the positioning sleeve 651, and the positioning sleeve is respectively installed in assembly holes on two side walls of the moving block 604 through the backup nut 652; the whole cross beam B603 is of a cuboid frame structure with upper and lower openings, through grooves are symmetrically formed in two sides of the cross beam B603 in the length direction, and the axial line of the through grooves in the length direction is equal to the center of an assembly hole of the movable block 604 in height; the lower end face of the fixed block 606 is fixedly connected with the platform 2, uniformly distributed threaded holes are formed in the upper end face of the fixed block 606 according to a rectangular array, and the bottom plate 601 is fixedly connected with the fixed block 606 through bolts; a baffle 609 for bearing external driving is further arranged between the upright posts 602 adjacent to the upper end face of the bottom plate 601, the lower end of the baffle 609 is fixedly connected with the bottom plate 601, and two ends of the baffle 609 are respectively fixedly connected with the upright posts 602.
The track terrace 706 is of a pre-buried steel solid beam structure, the cross section of the track terrace 706 is I-shaped, the upper end face of each track terrace 706 is parallel to the horizontal plane and is equal to the upper end face of the adjacent track terrace 704 in height, and the track terrace 706 is parallel to the long axis of the cuboid B702 and is equal to the cuboid B702 in length.
The bearing terrace 704 is of a pre-buried steel solid beam structure, the section of the bearing terrace is I-shaped, and the upper end face of each bearing terrace 704 is parallel to a horizontal plane and is equal in height to the upper end face of the adjacent bearing terrace 704.
The depth of the damping slot 705 is greater than the height of the cuboid B702.
The gas-liquid accelerating hydraulic cylinder used in the invention is shown in CN201910064612.X.
The application method of the invention comprises the following steps: the initial position of the movable mounting platform is located outside one end below the supporting truss, a test piece is placed on a damping buffer device on the movable mounting platform through lifting equipment, the test piece is limited and fixed through a boundary constraint device, the movable mounting platform is driven to enter a test position below the supporting truss, a lifting device on the movable mounting platform falls down, the bottom surface of the platform of the movable mounting platform is enabled to be in contact with a bearing terrace on a foundation, a gas-liquid accelerating hydraulic cylinder is started, and a punching plate is driven by the gas-liquid accelerating hydraulic cylinder to impact the test piece at a high speed, so that an impact test is completed.
In the structure of the whole test system, the unit upright posts of the support truss are independently designed for carrying out the early unit test, the effect is to provide evaluation for the whole structure of the system through test data, and the unit upright posts are combined with the system upright posts for use after meeting the conditions, so that the damage to the system upright posts during the normal test is avoided.
The invention is not described in detail in the prior art.
Claims (4)
1. A large-scale accurate impact test system, characterized by: comprising the following steps: the whole test system is used for performing impact load test by taking at least one set of gas-liquid acceleration hydraulic cylinder as a power source, the gas-liquid acceleration hydraulic cylinder is arranged on the support truss, the high-speed rod end of the gas-liquid acceleration hydraulic cylinder is provided with an impact plate for impact test, the support truss is arranged on the foundation and forms a closed frame structure with the foundation, the movable lifting platform is arranged on the foundation and positioned below the support truss, the damping buffer device is arranged in the middle of the movable lifting platform, the boundary constraint devices are symmetrically arranged on two sides of the upper end face of the movable lifting platform, and an impacted test piece is arranged on the damping buffer device and clamped and positioned through the boundary constraint devices;
The foundation comprises a foundation body made of reinforced concrete, wherein the foundation body is arranged in a foundation pit, two sides of the foundation pit are fixedly connected with supporting earthwork, an artificial foundation is arranged at the bottom of the foundation pit, the artificial foundation comprises a three-layer soil layer arranged on a soil layer, a sand shockproof layer arranged on the three-layer soil layer and a waterproof layer arranged on the sand shockproof layer, the foundation body is composed of a cuboid A and a cuboid B which are fixedly integrated, the length and the width of the cuboid A are smaller than those of the cuboid B, the cuboid A is positioned in the middle of the bottom surface of the cuboid B, and one end face of the cuboid A in the long axis direction is flush with one end face of the cuboid B in the long axis direction; the middle part of the upper end surface of the cuboid B is provided with an axial through groove, the middle part of the bottom wall of the through groove is provided with bearing terraces parallel to the long axis of the through groove at intervals, and two ends of each bearing terrace are respectively level with two ends of the cuboid A in the long axis direction; the two sides of the bottom wall of the through groove are respectively provided with a damping groove parallel to the long axis of the through groove, the two ends of each damping groove are respectively parallel and level with the two ends of the long axis direction of the cuboid A, the outer side wall of each damping groove is respectively coplanar with the side wall of the through groove on the same side, a track terrace is further arranged between each damping groove and the adjacent bearing terrace, and the height of the upper end face of the track terrace is smaller than that of the bearing terrace; rectangular grooves are further formed in the middle of the end faces of the cuboid B, which are located on two sides of the through groove, and embedded connecting steel plates used for connecting the upper supporting trusses are arranged in the grooves;
The support truss comprises unit upright posts, system upright posts and system cross beams, wherein the whole unit upright posts are of a box-shaped columnar structure and are symmetrically arranged on two sides of the upper end face of a foundation, the upper end faces of the two unit upright posts are respectively and fixedly connected with two ends of the bottom face of the system cross beam, the lower ends of the two unit upright posts are respectively and fixedly connected with embedded connecting steel plates arranged on two sides of the upper end face of the foundation, the system upright posts are equally high with the unit upright posts, the system upright posts are also symmetrically arranged on two sides of the upper end face of the foundation and are respectively and fixedly connected with the unit upright posts on the same side, the upper end faces of the two system upright posts are parallel provided with system cross beams with zero space, the lower ends of the two system upright posts are respectively and fixedly connected with the embedded connecting steel plates arranged on two sides of the upper end face of the foundation, the whole system cross beam is of a box-shaped beam structure, the width of the system cross beam is equal to that of the unit upright posts, and the middle part of the system cross beam is perpendicular to a horizontal plane and is provided with uniformly distributed mounting holes for mounting gas-liquid accelerating hydraulic cylinders;
The movable lifting platform comprises a platform, bearing vehicles, synchronous lifting devices and parallel tracks, wherein the parallel tracks are fixedly connected with a track terrace of a foundation, the whole platform is of a steel rectangular plate-shaped structure, connecting plates with parallel intervals are symmetrically arranged on two sides of the platform, guide holes are formed in each connecting plate, the bearing vehicles are symmetrically arranged below the connecting plates on two sides of the platform and run on the tracks, two ends of each bearing vehicle are respectively connected with two connecting plates on the same side of the platform through guide posts, and the two ends of each bearing vehicle are respectively provided with the synchronous lifting devices and control lifting of the platform through the synchronous lifting devices; the bearing vehicle is formed by combining two vehicle bodies through connecting rods A, the two vehicle bodies are respectively arranged below two connecting plates on the same side of the platform, the whole vehicle body is of a cuboid structure, rail wheels are arranged at two ends of the lower part of the vehicle body, through grooves perpendicular to the length direction of the vehicle body are formed in the middle of the upper end face of the vehicle body, synchronous lifting devices are arranged in the middle of the walls of the through grooves, guide posts are symmetrically arranged on the bottom walls of the through grooves on two sides of the synchronous lifting devices, the guide posts are matched with guide holes on the corresponding connecting plates of the platform, the front end of the connecting rod A is fixedly connected with the rear end of one vehicle body, and the rear end of the connecting rod A is fixedly connected with the front end of the other vehicle body; the synchronous lifting device is a synchronous oil cylinder, the synchronous oil cylinder is fixedly connected with the bottom wall of the through groove of the vehicle body through an oil cylinder seat, and the initial zero position of the synchronous oil cylinder is lower than the upper end surface of the vehicle body; the bearing vehicle is also provided with a synchronous motor which is arranged on the side surface of one vehicle body of the bearing vehicle and drives the wheel shaft of one rail wheel on the vehicle body through a speed reducing mechanism;
The boundary constraint device comprises a left movable jacking device and a right movable jacking device, the left movable jacking device is arranged on the left side of a long axis of the platform, the right movable jacking device is arranged on the right side of the long axis of the platform, the left movable jacking device and the right movable jacking device are symmetrical with respect to the long axis of the platform, the left movable jacking device comprises guide rail groups, a bottom plate, upright posts, a beam B, moving blocks, jacking blocks and fixing blocks, the number of the guide rail groups is two, each guide rail group consists of a pair of linear guide rails parallel to the short axis of the platform, the two guide rail groups are arranged on the left side of the length direction of the platform at intervals, fixing blocks are arranged on the platform between the two linear guide rails of each guide rail group, a bottom plate is arranged above each guide rail group, the bottom plate is detachably fixedly connected with the platform through the fixing blocks, two sides of the bottom plate bottom surface are respectively operated on the parallel linear guide rails through sliding blocks, one side of the upper end surface of the bottom plate, which is perpendicular to the upper end surface of the guide rail, the beam B is arranged above the two bottom plate and is respectively fixedly connected with the two upright posts on the two adjacent upright posts, and the two jacking blocks are respectively arranged on the middle part of the two upright posts in a clamping mode, and each upright post is fixedly connected with the movable cross rail B; the whole movable block is of a rectangular box-type structure with two open ends, the external dimensions of the two open ends of the movable block are matched with the external dimensions of the cross section of the cross beam B, and the two side walls of the movable block are symmetrically provided with assembly holes for installing the jacking block; the jacking block consists of a positioning sleeve, a backup nut and a fastening bolt, the whole positioning sleeve is of a cylindrical structure, a threaded through hole is formed in the positioning sleeve, the fastening bolt for jacking a test piece is arranged in the threaded through hole, and external threads are respectively arranged at two ends of the outer cylindrical surface of the positioning sleeve and are respectively arranged in assembly holes on two side walls of the moving block through the backup nut; the whole beam B is of a cuboid frame structure with upper and lower openings, through grooves are symmetrically formed in two sides of the length direction of the beam B, and the axial line of the through grooves in the length direction is equal to the center of the assembly hole of the movable block in height; the lower end face of the fixed block is fixedly connected with the platform, the upper end face of the fixed block is provided with uniformly distributed threaded holes according to a rectangular array, and the bottom plate is fixedly connected with the fixed block through bolts; a baffle plate for bearing external driving is arranged between the upright posts adjacent to the upper end surface of the bottom plate, the lower end of the baffle plate is fixedly connected with the bottom plate, and the two ends of the baffle plate are respectively fixedly connected with the upright posts;
the depth of the damping groove is larger than the height of the cuboid B.
2. The large-scale precision impact test system according to claim 1, wherein: the damping buffer device consists of a cylinder body, a cylinder seat, a cylinder cover, a piston, a connecting rod B, a bearing plate, buffer blocks and guide rods, wherein the cylinder seat is fixedly connected with the platform through bolts, the lower end of the cylinder body is fixedly arranged on the cylinder seat and is in sealing connection with the cylinder seat, the cylinder cover is fixedly arranged at the upper end of the cylinder body and is in sealing connection with the cylinder body, the piston is arranged in the cylinder body and is in sliding sealing fit with the cylinder body, the cylinder seat is respectively provided with an air inlet hole and an air outlet hole which are communicated with the interior of the cylinder body, the middle part of the piston is provided with coaxial axial through holes A, the axial through holes C which are uniformly distributed are arranged with the through holes A as the center, each axial through hole C is internally provided with the guide rods, the lower ends of the guide rods are arranged on the cylinder seat, the upper ends of the guide rods are arranged on the cylinder cover and are fixed through the cylinder cover in a compressing mode, springs are sleeved between the lower ends of the guide rods and the piston, the connecting rod B is arranged in a penetrating way at the middle of the cylinder cover and is in sliding sealing fit with the cylinder cover, the lower ends of the connecting rod B are fixedly integrated with the piston, the upper ends of the connecting rod B are fixedly connected with the bearing plate, and the bearing plate is provided with the buffer blocks; the guide rod is integrally of a step shaft structure made of high-strength alloy steel and comprises a first step shaft, a second step shaft, a transition part and a positioning shaft, wherein the first step shaft is arranged in an axial through hole C of a piston in a penetrating mode and is in sliding sealing fit with the axial through hole C, the diameter of the first step shaft is larger than that of the second step shaft, the upper end of the first step shaft is provided with a coaxial positioning shaft, the lower portion of the first step shaft is provided with a coaxial second step shaft, the transition part is arranged between the first step shaft and the second step shaft and is integrally fixed through the transition part, the transition part is of a cone frustum structure, the diameter of the upper end face of the transition part is equal to that of the first step shaft, and the diameter of the lower end face of the transition part is equal to that of the second step shaft; the upper end surface of the cylinder seat is provided with uniformly distributed mounting holes corresponding to the axial through holes C of the piston one by one, and the inner diameter of each mounting hole is in clearance fit with the outer diameter of the second step shaft of the guide rod; the lower end surface of the cylinder cover is provided with uniformly distributed positioning holes corresponding to the axial through holes C of the piston one by one, and the inner diameter of each positioning hole is in clearance fit with the outer diameter of the positioning shaft of the guide rod; the connecting rod B is coaxially provided with an inner hole with an opening at one end, and the opening end of the inner hole is positioned at the lower end of the connecting rod B and communicated with the axial through hole A of the piston; the inlet end of the air inlet hole of the cylinder seat is communicated with an external air inlet pipeline through a check valve, and the outlet end of the air outlet hole of the cylinder seat is communicated with an external loop through a pressure reducing valve.
3. The large-scale precision impact test system according to claim 1, wherein: the track terrace is of an embedded steel solid beam structure, the cross section of the track terrace is I-shaped, the upper end face of each track terrace is parallel to the horizontal plane and is equal to the upper end face of the adjacent track terrace in height, and the track terrace is parallel to the long axis of the cuboid B and is equal to the cuboid B in length.
4. The large-scale precision impact test system according to claim 1, wherein: the bearing terrace is of a pre-buried steel solid beam structure, the section of the bearing terrace is I-shaped, and the upper end face of each bearing terrace is parallel to a horizontal plane and has the same height as the upper end face of the adjacent bearing terrace.
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| CN111177952B (en) * | 2020-03-05 | 2023-09-19 | 沈阳理工大学 | Device and method for identifying rigidity and damping parameters of concrete foundation-soil contact surface |
| CN115585960B (en) * | 2022-12-07 | 2023-03-28 | 山东福阳液压科技有限公司 | Hydraulic cylinder leakproofness testing arrangement |
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